Well I would say anything above 80 is ideal. I don't think too hot is really a thing because if it's too hot for the gun it's too hot for you too lol you'll sweat all the water out of your body before you can drink enough to replenish if you're a very actively moving player like me.

On the subject of MAPP, that's what? Propane and butane or something? Couple questions. What happens if that and green gas a present in the same mag? Problems? And how's the lubrication work with that?

Decide after you've experienced the smell! As noted I won't even store the canister in my shed the gas smells so bad. Stinks bad during shooting and the magazines stink long afterwards.

It does produce more pressure at colder temperature than propane. Someone produced a chart a couple of months ago. Perhaps a search will find it.

The cylinder I have is labelled MAP-PRO and is not really MAPP. True MAPP may be available outside the US but in the spring of 2008, true MAPP gas production ended in North America (code for USA and Canads) when production was discontinued at the only remaining plant making it. Current products labeled "MAPP" are in fact MAPP substitutes. These versions are stabilized liquefied petroleum gas (LPG) with high levels of propylene.

My LM4 has issues in low temperature. Under 60 degrees and it just flips a ****. I'll either get a triple feed (I haven't done the o-ring barrel mod) or the gas valve gets stuck down and all the gas comes out. I got my other 4 mags the other day and waited for it to hit 65. I went outside and dumped all 5 no problems whatsoever. If I try doing that in 50 degree weather forget it. Something has to be wrong, but I can't figure out what it is and I don't plan on playing with it except in the summer and in doors anyway.

You have to use weather appropriate lube. Meaning thick lube in the hotter temps and thinner lube in the winter months. I'm in California and I play with my LM4's in temps ranging from 40 to 100 degrees. Obviously the idea is to try to keep the gas as warm as possible in the cold weather, but in the heat you should be fine as long as there are no pre-existing problems.

I've found that using Frog Lube on the piston o-ring is not a good thing. It swells the o-ring (to the point where it restricts movement) and leaves the chamber area dry. I use Frog Lube on everything else aside from that area. In the summer a thick silicone oil and in the winter a thin oil will work great in that area. The base plug also needs the appropriate lube as well, so don't forget to get some oil on that when you pull the bolt/piston.